War elephants<span> played a critical role in several key battles in antiquity, but their use declined in the Middle Ages. With the spread of firearms in the early </span>modern period<span>, military </span>elephants<span> were restricted to non-combat engineering and labour roles, and some ceremonial uses.</span>
The Soviet Union launched Sputnik in October 1957.
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The Important Relationship between Forests and Air. Not only do trees produce oxygen, but they also improve air quality in some unexpected ways. ... As trees transpire, they release water into the atmosphere through their leaves.
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